Feed-water heater



(No Model.)

W. T. ANDREWS., FEED WATER HEATER.

Patented Apr. 26, 1887;

Ew/ifm Wiz/260666. l 26, 2g,

Tag/dmv@ NITED STATES PATENT OFFICE.

WILLIAM T. ANDREVS, OF BOSTON, MASSACHUSETTS.`

Y FEED-WATER HEATER.

SPECIFICATIQN forming part of Letters Patent No. 361,803, dated April 26, 1887.

Application filed January 2S, 1887. Serial No. 22",?90.

T0 all whom it may concern:

Be it known that I, WILLIAM T. ANDREWS, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Imp rovements in Feed-Water Heaters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to. letters or gures of reference marked thereon, which form a part of this specification.

This invention relates to improvements in feed-water heaters,77 so called. These feeders are generally arranged with a continuous coil or coils of pipe through which feed-Water is permitted to pass. IVhile in its passage therethrough it is subjected to the influence of steam,which surrounds and circulates about said coil.

My improvements pertain more particularly to the class of feed-water heaters above premised in which corrugated tubing is employed; but in the use of this tubing, which is very much thinner than plain tubing, some objections occur, which I have endeavored to overcome and which is the object of this invention.

The drawings accompanying this specifica- Y tion represent, in Figure l, a central vertical with corrugated tubing.

sectional elevation of a feed-water heater embodying my improvements. Fig. 2 is a plan of the same, in which plain tubing is employed. Fig. 3 is an enlarged section showing the manner of connecting the annular tubes to the central tube. Fig. 1i is a sectiomand Fig. 5 a plan of the same which represent a modication in the disposition of the annular tubes.

Hitherto certain objections have existed in the coil feed-water heaters as now constructed This latter is decidedly superior to the plain tubing, since a thinner metal may be employed, greater efficiency in the transmission, of heat is acquired, while superior strength and increased surface are gained by the corrugations. It has been found, however, that when the coil is employed for the transmission of the feed-Water, and, moreover, since said coil is secured only at its outlet and inlet ends to the steam -j acket, a certain vibration and spring are caused at such (No model.)

points ofjuncture, owing to the extreme ilexibility of the tubing which forms the coil. Furl thcrmore, friction and wear are consequently the result between the several turns composing the coil, and the life of the latter is very much impaired and shortened.

The primary object of my invention is to avoid this diihculty and yet continue the use of the corrugated tubing, if dcsired,wit.h all its inherent advantages. At the same time I wish to obtain greater heating-surface in the same space, and thus derive greater benefit from the steam-supply, preferably exhaust, as it circulates about the coil.

In the accompanying drawings, A represents a closed cylindrical vessel or jacket provided with supply and outlet passages a b, respectively, by which la flow of steam is maintained therethrough. This' jacket is mounted upon and bolted to a second closed vessel, B,which serves as a base for the heater as an entirety and is used as a settlingchamber and furnished with an outlet-pipe, c, through which sediment from the water can be discharged and the heater cleansed. Centrally disposed upon the top of this chamber B, and in the present instance forming part of the same, rises a hollow vertical tube, @,which extends to the closed top of the jacket A and is bolted thereto. Furthermore, a supply feed-water pipe, d, is entered into the chamber B,while the dischargepipe e is arranged to engage with the central tube, G, at the top and delivers the hot water,

which naturally rises and collects there, to a tinuous length of coiled pipe as now employed,

I have'subdivided it into a series of short annular tubes, s s s2 s3 8*, 85o., preferably circular in shape. These tubes are to be disposed about the tube C and secured thereto in themanner as indicated in Fig. 3 of the drawings. The tube Gis cast with perforations, spirally or otherwise arranged, to admit the ends f f of the tube over bosses g g, which are formed about said perforations. The ends of the tubes are forcibly thrust over said bosses, and a bindingring, h, shrunk or forced eXteriorly about the Whole, locks them securely to the tube. These annular` or semi-annular tubes may be secured to the tube C in several other well-known ways, and the arrangement of said tubes within the loo e Y y 361,803

shell of the tube C may be changed or altered at pleasure. I do not desire to be limited to the precise mode of arranging nor to the method of attaching said tubes to the main supporting-tube C. To prevent free passage of the water through the bore of the tube C before being thoroughly heated, I have inserted partitions z' i. Consequently the water under the action of the pump (not shown) is estopped from passing directly upward through the tube C and compelled to circulate through the tubes 3,8m., in its passage through the heater.

In Figs. 4 and 5 I have shown amodilied arrangement of the annular tubes s s s about the central one, C, wherein said tubes are disposed in four vertical series, the latter in quadrature about said tube C. By this method of isolating the tubes s each one is kept apart from the adjacent ones, but little vibration occurs, and all attrition between the individual parts composing the heater is obviated.

When in operation, steam enters at the top of the jacket A through the inlet-aperture a and escapes at the bottom by way of the pipe b, or viceversa. On the other hand, the feedabove said partition.

through the water becomes thoroughly heated. Y

I find that when these annular tubes s are obliquely disposed with regard to the axis of the central tubes, lthe natural flow of water upward as it becomes heated is accelerated. However, I do not wish to confine myself to this precise position, since they may be set at right angles to the aXis of said tube, norin the direction and ow of the Water or steam supply, since they may be reversed and changed with its feed-pipe d, in combination with the hollow tube C, interconnecting the supplychamber B with the discharge feed-Water pipe e and furnished with a series of independent annular tubes, s, substantially as described.

In testimony whereof I afX my signature in presence of two witnesses.

y v WM. T. ANDREWS.

lVitnesses:

H. E. LODGE, F.' OURris. 

